<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>

        * {
            margin: 0;
            padding: 0;
        }

        .container {
            display: flex;
            flex-direction: row;
        }

        .left {
            width: 200px;
            height: 100vh;
            background-color: #FFEE88;
        }

        .right {
            width: 200px;
            height: 100vh;
            background-color: #998833;
        }

        .main {
            width: 100%;
            height: 100vh;
            background-color: #FFECE4;
        }
    </style>
</head>
<body>
<div class="container">

    <div class="left">左</div>
    <div class="main">中</div>
    <div class="right">右</div>
</div>
</body>
</html>
